Blank initial residual stress high-precision reverse solving method based on a deformation test

Abstract

The invention discloses a blank initial residual stress high-precision reverse calculation method based on a deformation test, and the method comprises the steps: determining a deformation measurementpoint of a to-be-measured part according to the thickness of an aluminum alloy blank plate, and obtaining a flexibility matrix of the measurement point through employing a finite element method; Measuring the actual deformation value of the part measuring point by using a three-coordinate measuring machine; processing the to-be-detected part to meet the size requirement by using high-speed processing, and solving equivalent residual stress in the rolling direction and the transverse direction; residual stress in the rolling direction and the transverse direction of the part is obtained. In the method for testing the initial residual stress of the blank, the determination of the Legendre polynomial order is determined according to the principle that the stress uncertainty is minimum, and the method can specifically refer to a calculation method of the stress uncertainty of a crack flexibility method. The method provided by the invention is simple, high in measurement precision and easyto realize on site.

Description

technical field [0001] The invention relates to a residual stress testing technology, in particular to a high-precision reverse calculation method for the initial residual stress of a blank based on deformation testing. Background technique [0002] During the processing of aluminum alloy aviation integral structural parts, the initial residual stress of the blank is considered to be the most important factor affecting the processing deformation. In order to accurately measure the residual stress inside the aluminum alloy thick plate, researchers at home and abroad have done a lot of research work in this field. After decades of development, various residual stress testing methods have emerged and improved continuously. According to whether the test method causes damage to the workpiece under test, the residual stress test method is divided into destructive test method and non-destructive test method. For example, neutron diffraction method, crack flexibility method, delam...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a test method for inverting the residual stress through the deformation of the sample, which overcomes the shortcomings of the existing test methods, such as poor practicability and large errors

Images